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Open Access Nano Express

Promoting Effect of Layered Titanium Phosphate on the Electrochemical and Photovoltaic Performance of Dye-Sensitized Solar Cells

Ping Cheng1*, Ruihao Chen1, Junfei Wang1, Jianong Yu1, Tian Lan1, Wanjun Wang1, Haijun Yang1, Haixia Wu1 and Changsheng Deng2*

Author Affiliations

1 National Key Laboratory of Nano/Micro Fabrication Technology, Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

2 State Key Lab of New Ceramics and Fine Processing, Institute of Nuclear & New Energy Technology, Tsinghua University, Beijing, 100084, People’s Republic of China

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Nanoscale Research Letters 2010, 5:1313-1319  doi:10.1007/s11671-010-9644-8

Published: 20 May 2010

Abstract

We reported a composite electrolyte prepared by incorporating layered α-titanium phosphate (α-TiP) into an iodide-based electrolyte using 1-ethyl-3-methylimidazolium tetrafluoroborate(EmimBF4) ionic liquid as solvent. The obtained composite electrolyte exhibited excellent electrochemical and photovoltaic properties compared to pure ionic liquid electrolyte. Both the diffusion coefficient of triiodide (I3) in the electrolyte and the charge-transfer reaction at the electrode/electrolyte interface were improved markedly. The mechanism for the enhanced electrochemical properties of the composite electrolyte was discussed. The highest conversion efficiency of dye-sensitized solar cell (DSSC) was obtained for the composite electrolyte containing 1wt% α-TiP, with an improvement of 58% in the conversion efficiency than the blank one, which offered a broad prospect for the fabrication of stable DSSCs with a high conversion efficiency.

Keywords:
Diffusion; Charge transfer; Layered α-titanium phosphate; Ionic liquid